Ah I see, for 19 they asked MAX power so its P = VI
If they asked average, then its VI/2
For 25, I'm very confused
For 37, I answered B as well, but its actually D
For 17, so if two EMFs/voltages are in parallel, we can just add them up along with their internal resistance to make one new unit? I thought this only works if they are in series, only then we can add them up to make one new voltage/EMF @kevG
Hahahaha, you nearly got all of them right!

Guys, for that question I have a feeling the markscheme might be correct. As the question mentioned that it is the "Power is calculated" which means that the uncertainty of power is the one that has been processed.
On the other hand, for example, in this question, the volume was the measured variable, and radius was the processed one. Here, after making the radius the subject and add the uncertainty % we get the answer, which is 8% in the markscheme.
I'm not so sure if this logic is right, what do you guys think? @Vioh @ibstudent321

hey guys, I've got a doubt regarding dissisipation of power.
How do we know when to use P = I^2 R
P = V^2 / R
P = VI
Is there some rule I'm not aware of? For some reason, P = I^2 R is used for power lost, and P = VI is used for total power. Hope to hear form u guys soon!

Hey guys, is there a huge difference in the education and future opportunities for employment in the engineering field between these two countries? If I go to the USA, then I'd have to go to a community college in the first two years first/

wow thanks so much. For the electron question, I did exactly the same method and I wasn't sure whether it didn't get deflected at all or it got deflected slightly upwards. My logic was that an alpha particle would get deflected upwards as it had a +2 charge. This is because this same electric field managed to cancel out the force on the magnetic field for an electron particle, so won't it slightly deflect an alpha particle upwards due to a heavier charge?